SPECIAL STORY FEED & ADDITIVE MAGAZINE August 2022 53 MORE HEALTHY GUT UNDER HEAT STRESS WITH FRA® BUTYRIN HYBRID They found out that the favourable effects of FRA® Butyrin Hybrid Dry on heat stressed broilers, may have been the result of the gut supporting abilities of the feed additive, which agrees with knowledge from literature. In the current trial, FRA® Butyrin Hybrid Dry significantly improved villi height compared to the control group as well in the duodenum as in the jejunum and ileum as shown in Figure 1, thereby significantly improving villi height to crypt depth ratio (VH:CD ratio) from approximately 3.7 till 6.5 in each intestinal segment compared to the control group (see Figure 2). A higher VH:CD ratio results in a decreased turnover of the intestinal mucosa, which decreases the maintenance requirement and finally can result in a higher growth efficiency of broilers. Furthermore, higher villi increase the nutrient absorption area in which more feed is available for the animal resulting in higher growth rates. The improved intestinal integrity could be one of the explanations why higher growth rates and a more efficient feed conversion rate was observed when FRA® Butyrin Hybrid Dry was fed (Table 1). MORE BALANCED MICROBIOME UNDER HEAT STRESS WITH FRA® BUTYRIN HYBRID Heat stress not only causes damage to the gut, it also alters the composition of the microbiota in an unfavourable way. From the current trial it becomes clear that under high ambient temperatures FRA® Butyrin Hybrid Dry could help maintaining a healthy microbiome in broilers. As can be concluded form Figure 3, viable counts of the beneficial Bifidobacterium and Lactobacillus were increased with 56.9% and 7.1% respectively when compared to the control group. On the other side, the potential pathogenic bacteria Clostridium perfringens and Escherichia coli were greatly reduced with 26.1% en 18.6% compared to the control. This improvement in microbiota balance is in line with results from other scientific experiments. Figure 1. Effect of FRA® Butyrin Hybrid Dry on duodenal, jejunal and ileal villi height (µm) in heat stressed broilers. abBars per intestinal segment with a different superscript are significant different (p≤0.05). Figure 2. The effect of FRA® Butyrin Hybrid Dry on duodenal, jejunal and ileal VH:CD ratio in heat stressed broilers. abBars per intestinal segment with a different superscript are significant different (p≤0.05).
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